Installing the RAT moduleΒΆ
To install the Raster Attribute Table support:
- From the website download page, locate your release, and download: geoserver-2.27.x-rat-plugin.zip - Warning - Make sure to match the version of the extension to the version of GeoServer. 
- Extract these files and place the JARs in - WEB-INF/lib.
- Perform any configuration required by your servlet container, and then restart. 
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